Hi,
I have decided to built a magnetic driven planar speaker.
Got most of the parts, and the design is illustrated below. A perforated steel plate as I have used in my ESL projects, with 10x10x40mm neo magnets. A alu frame in 1/2" x 1/2" square alu tube provides stiffness and spacing between diaphragm and magnets (distance will be 2,7mm + 1mm vhb tape.
Diaphragm will be 6micron mylar, with 9mm wide CPC alarm tape as conductor (0,6 ohms/meter resulting in a 5,4 ohm dc resistance I should imagine.
Horisontal spacing between magnets will be 15mm, and 10mm vertical spacing.
Outer dimensions of the frame will be 190mm wide and 1000mm high.
There will be 8X18 = 144 magnets pr speaker.
As the back plate is bigger than the diaphragm, it will be easy to mount baffles, and easy to add a ribbon tweeter if I should decide to do so later.
I am very exited by this project, it should be easy to build and hopefully give more satisfying results than my ESL attempts has given so far.
Any comment to my idea? Should i make it wider, bigger/smaller distance between magnets, distance between magnets and diaphragm?
Theese magnets cost a fortune, so I am reluctant to increase the number of magnets in the first test (I have 205 in stock)
All that remains now, is to unite theory with practice and see how it turns out!
Regards,
Bent
I have decided to built a magnetic driven planar speaker.
Got most of the parts, and the design is illustrated below. A perforated steel plate as I have used in my ESL projects, with 10x10x40mm neo magnets. A alu frame in 1/2" x 1/2" square alu tube provides stiffness and spacing between diaphragm and magnets (distance will be 2,7mm + 1mm vhb tape.

Diaphragm will be 6micron mylar, with 9mm wide CPC alarm tape as conductor (0,6 ohms/meter resulting in a 5,4 ohm dc resistance I should imagine.
Horisontal spacing between magnets will be 15mm, and 10mm vertical spacing.
Outer dimensions of the frame will be 190mm wide and 1000mm high.
There will be 8X18 = 144 magnets pr speaker.
As the back plate is bigger than the diaphragm, it will be easy to mount baffles, and easy to add a ribbon tweeter if I should decide to do so later.
I am very exited by this project, it should be easy to build and hopefully give more satisfying results than my ESL attempts has given so far.
Any comment to my idea? Should i make it wider, bigger/smaller distance between magnets, distance between magnets and diaphragm?
Theese magnets cost a fortune, so I am reluctant to increase the number of magnets in the first test (I have 205 in stock)
All that remains now, is to unite theory with practice and see how it turns out!
Regards,
Bent